The IBM 1620
Released in October of 1959, the IBM 1620 was focused on the science market as an inexpensive scientific computer.
From Wikipedia:
The IBM 1620 was announced by IBM on October 21, 1959, and marketed as an inexpensive “scientific computer”. After a total production of about two thousand machines, it was withdrawn on November 19, 1970. Modified versions of the 1620 were used as the CPU of the IBM 1710 and IBM 1720 Industrial Process Control Systems (making it the first digital computer considered reliable enough for real-time process control of factory equipment).
IBM 1620. (2011, July 18). In Wikipedia, The Free Encyclopedia. Retrieved 19:17, July 21, 2011, from http://en.wikipedia.org/w/index.php?title=IBM_1620&oldid=440179344
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